Those wing bolts are a pain. I knocked a some off when putting mine back together. Said F-it and put it together with only about 5. I will redo it sometime this spring. I think if you use some duct tape to keep them in place you should be able to get it together without knocking them out. Wrap the painted part with painters plastic so you can handle it better without scratching the heck out of the paint. Wish I would have done that.

Mirrors. Take them off. Pull the rubber part off and look inside. You will see a round clip holding the glass part on the pivot ball. Use some needle nose plyers to remove the clip and pull off the glass. There are a couple(maybe 4) screws that hold plastic part on to the frame.

Don't worry about the flex agent. You don't need it

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81 300SD daily driver/project
86 420SEL (sold)
85 380SE(in the graveyard)